TAILIEUCHUNG - Programmable Logic Controller plant through MMI Part 2

Tham khảo tài liệu 'programmable logic controller plant through mmi part 2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 6 Programmable Logic Controller plant through MMI. A work piece flows through a plant. A plant is further decomposed into standard resource groups hierarchically. Any standard resources can be classified using 3-level hierarchy of resource group-device group-standard device A plant is composed of resource group such as mechanical parts sensor actuator and MMI. A resource group consists of device group . For example actuator resource group is composed of solenoid relay stepping motor AC servo motor and cylinder device group and so on. Sensor resource group is composed of photo sensor proximity switch rotary encoder limit switch ultrasonic sensor counter timer and push button device group and so on. Finally device group consists of standard devices which can be acquired at the market. To facilitate the modular design concept of modern AMS the structure of AMS is modeled using an UML class diagram based on the proposed generic AMS structure. By referencing this generic AMS structure FA engineers can derive the structure model of specific AMS reflecting special customer requirements easily. Figure 5 represents a static structure model of an example application prototype. Various kinds of device group class such as proximity switch and counter are inherited from generic resource group class such as sensor. Fig. 5. Class diagram of example prototype Since the real FA system is operated by the signal sending and receipt among manufacturing equipments such as PLC sensors and actuators it is essential to describe the interactions of FA system components in detail for the robust design of device level control. This detail description of interactions is represented in the interaction model. UML provides the activity diagram state diagram sequence diagram and communication diagram as a modeling tool for dynamic system behaviors. Among these diagrams the Object-Oriented Modeling Simulation and Automatic Generation of PLC Ladder Logic 7 activity diagram is most suitable for the

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